/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.impl;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.jbfilter.hibernate.exception.DataAccessException;


public class HibernateTemplate {
	private SessionFactory sessionFactory;
	
	public HibernateTemplate(SessionFactory sessionFactory) {
		super();
		this.sessionFactory = sessionFactory;
	}
	
	public <T> T execute(HibernateCallback<T> callback) throws DataAccessException {
		Transaction tx = null;
		Session session = null;
		try {
			session = sessionFactory.openSession();
			tx = session.beginTransaction();
			T retour = callback.doInHibernate(session);  
			tx.commit();
			return retour;
		} catch (Throwable e) {
			if (tx != null) {
				tx.rollback();
			}
			throw new DataAccessException(e);
		} finally {
			try {
				if (session != null && session.isOpen()) {
					session.close();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}
